--- title: "Trina Solar TSM-NEG21C.20 725W 725W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-NEG21C.20 725W 725W solar panel. Specs: 23.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-tsm-neg21c-20-725w" updated: 2026-09-11 --- # Trina Solar TSM-NEG21C.20 725W Space saver, no clear weak spot 420 panels in the segment TOPCon 700-750 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-NEG21C.20 725W - **Series:** Vertex N N-type i-TOPCon - **Rated power:** 725 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 700-750 W (420 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 725 W | 715 W | Strong - top 17% | | | Module efficiency | 23.30% | 23.00% | Strong - top 19% | 1,017 | | Power density | 233.4 | 230.2 | Strong - top 18% | 936 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 38.3 kg | 38.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.30% | 23.00% | Strong - top 19% | 1,017 | | Power density | 233.4 | 230.2 | Strong - top 18% | 936 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.8 | 52.9 | Typical | 6,514 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **233.4 watts per square metre** - Top 18% of the TOPCon 700-750 W segment, against a median of 230.2. - **23.30% module efficiency** - Top 19% of the TOPCon 700-750 W segment, against a median of 23.00%. - **Best for:** Residential, commercial, utility-scale and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 725 W - **Efficiency:** 23.30 % - **Voltage at Pmax (Vmp):** 41.50 V - **Current at Pmax (Imp):** 17.47 A - **Open-circuit voltage (Voc):** 49.60 V - **Short-circuit current (Isc):** 18.54 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 10.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.3 kg - **Area:** 3.11 m2 - **Power density:** 233.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 634 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1017 of 14005 | | Power density | 936 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 6514 of 14005 | | Warranty | 21 of 14005 | ## About this series Trina Solar Vertex N panels based on **advanced N-type i-TOPCon technology** are the foundation of modern installations, eliminating typical limitations of older P-type cells. The use of an innovative cell structure allows for achieving significantly higher efficiency and minimizing light-induced degradation, which translates into stable energy yield for decades. This series stands out with an **excellent temperature coefficient**, making it an ideal solution for Polish climatic conditions, where modules maintain high efficiency even on hot days. Thanks to its design based on the 210 mm platform, Vertex N offers **maximum power density** on limited roof space, solving the problem of space shortages in ambitious prosumer projects. This solution is dedicated to both demanding private investors and large-scale photovoltaic farms looking to optimize LCOE costs. Compared to market competition, **increased module bifaciality** and better performance in diffused light guarantee a faster return on investment. By choosing this series, you opt for **exceptional durability and reliability** confirmed by a long-term warranty, which sets these components apart from standard solutions available on the market. ## Notable figures - At 23.3% efficiency, this panel is on par with typical \*\*TOPCon 700-750W\*\* modules - At 233.4 W/m² power density, this panel generates 3.2 W/m² more per unit area than \*\*TOPCon 700-750W\*\* median (230.2 W/m²) - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 700-750W\*\* median - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - In the top 7% for efficiency among all TOPCon panels ## Questions ### How does i-TOPCon technology in Trina Vertex N panels differ from standard P-type panels? i-TOPCon is an N-type cell technology featuring an additional passivation layer on the rear side of the cell, which reduces electron recombination and boosts module efficiency up to 23.3%. Unlike older P-type cells, Vertex N panels have lower annual degradation (around 0.4% after the first year) and better resistance to LID, light-induced degradation, allowing the module to retain higher power output for longer. ### What is the maximum power output of the Trina Vertex N panel, and how many modules are needed for a typical 10 kWp system? Panels in the Vertex N series reach a maximum power output of up to 725 Wp. At this power rating, a 10 kWp system requires roughly 14 panels, significantly fewer than classic 400-450 W modules. This reduces the number of panels needed and simplifies installation on smaller roof areas. ### Does the bifacial design of Vertex N panels actually increase energy production? Yes, the dual glass construction with an exposed rear cell surface generates an additional 10% to 20% energy from reflected light, depending on ground albedo (e.g., light gravel, white roofing membrane, or winter snow). The effect is especially noticeable on ground-mount systems or trapezoidal roofs with light-colored coverings, where the module has unobstructed access to light from both sides. ### What warranty comes with Trina Solar Vertex N panels, and what does it cover? The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty guaranteeing at least 87.4% of nominal power retained after that period. As a Tier 1 manufacturer with a long track record, Trina Solar offers reliable warranty enforceability, which matters given such a long coverage period. ### Do Vertex N panels perform well on hot roofs during summer? Yes, the series features a favorable power temperature coefficient, meaning less output loss as module temperature rises on hot days. This is a real advantage in Polish climate conditions, where roof surface temperatures in summer can significantly exceed ambient air temperature, reducing the yield of less optimized panels. ### Are Trina Vertex N panels suitable for large solar farms, or only residential installations? The Vertex N series works well for both applications. High power density on the 210 mm platform and a low-voltage design allow more modules to be connected per string, lowering LCOE, which is especially cost-effective for utility-scale solar farms. At the same time, its compact per-panel power output makes it attractive for residential systems with limited roof space. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DT-M-0042_NEG21C20_EN_2025_A-593dd9faf7e3.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -45 W, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -50 W, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -30 W, lighter, +1.6 pp | | [AIKO AIKO-A690-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a690-mae78dw) | 690 W | -35 W, lighter, +1.4 pp | | [AIKO AIKO-A685-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a685-mae78dw) | 685 W | -40 W, lighter, +1.2 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +35 W, cooler, +1.2 pp | | [AIKO AIKO-A680-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a680-mah78dw) | 680 W | -45 W, lighter, +1.0 pp | | [Trina Solar TSM-DEG21C.20-645](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-645) | 645 W | -80 W, hotter, -2.5 pp | | [Trina Solar TSM-DEG21C.20-650](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-650) | 650 W | -75 W, hotter, -2.4 pp | | [Trina Solar TSM-DE21-655W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-655w) | 655 W | -70 W, lighter, -2.2 pp | | [Trina Solar TSM-DE21-660W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-660w) | 660 W | -65 W, lighter, -2.1 pp | | [Trina Solar TSM-DE21-665W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-665w) | 665 W | -60 W, lighter, -1.9 pp | | [Trina Solar TSM-DE21-670W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-670w) | 670 W | -55 W, lighter, -1.8 pp | | [Trina Solar TSM-DE21-675W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-675w) | 675 W | Hotter, lighter, -1.6 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +80 W, cooler, +1.8 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-neg21c-20-725w Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.